Value Roll Ups to Area Objects

I have the same question, and to add onto it; would it be possible to use relative referencing to obtain this? For example, we have the functions "MyArea", "MyContainer" and "Me", the last one aggregates all object alarms in an area if using an alarm border..

So, could there not be a function like "MyObjects", to sum all objects' kW values contained by an area? For example in the area, in the script: "Me.TotalkW = MyObjects.kW".

Lakshay, If you are thinking about something else or would like to clarify or add onto this, please feel free to do so

Thank you Jakob for supporting my request. I was thiking of the same thing a function like MyObjects.kW and to be honest, all this information is with System Platfrom thanks to Model Hierarchy and like they do with Alarms. Thiss type of function just needs to be there else someone expert here as a innvovtive way to solve this.

Just adding a thought, could Object Wizards help you structure your model.

With the later versions of SP, Wizards options can be configured by the import feature.

Hello Jakob, 

Thank you for putting forth your views here. The challenge is not here to structure the model, rather we have already defined and beautifully structured it. It's the need of aggregating attribute values from child objects like kW at parent (Area Object Level) w/o specifying each object in scripting.

My quick thought would be to use historian and run a query/store-procedure to calculate it (we also support expressions in historian)

As this is not a out of the box feature I have in some projects created logic to have an energy object register it self in a array (setting the array and unique position as IO Source) on the contained object (or area), when going on-scan, and ensure the kW value is updated to this to.

Then the array/contained object is summarizing this as total kW.

It requires some tinkering to get the logic working, but it is an alternative if you can not do this on a Historian level where expressions are possible on the trend client. or by some smart query to summarize based on your object hierarchy.

It will require some arrays to manage the 'Registration' and you need to unregister your object if its undeployed etc. to keep the arrays on the summarization object clean.
You also need to manage the deployment selection 'Preserve Runtime Changes' since un-selecting this will clear the array and objects has to re-register to function fully.

To summarize an slightly confusing answer from my side, I would love a native solution for this, but with enough tinkering its possible  but I guess this is where you started out with your question.

Thanks IDO, well that would mean that we would be querying Historian from each Area Object periodically and update the data that is already present in object. Plus, Historian would not be live data. I would have used Historian if I had to do reports and do backdated calculations.

Thanks Richard, definitely a quirky way to do things. Yes those workarounds and with the dlls are still available. But I was looking for a more native and non-programmer friendly way.  Just wondering how you manage your array size if the attribute is an array and is defined on configuration. 

It all depends on how dynamic you want it to be, you could use a fixed, max range with a reasonable amount of positions. Or you could work with the MyArray.Dimension1 attribute, to set the array size depending on circumstances.

Yups, just one consideration that I have to check is how much is the max range of this Array Dimmension. That would mean I can't have more than that objects under one area.